\begin{table}[htbp]\centering
\caption{\textbf{Cumulative Descriptive Statistics}. Cumulative mean and standard deviation (in parenthese) by each historical dataset.\label{tab:desc\_all}}
\begin{tabular}{l*{4}{c}}
\hline\hline
                    &\multicolumn{1}{c}{GSS}&\multicolumn{1}{c}{GPSS}&\multicolumn{1}{c}{Pew Priority}&\multicolumn{1}{c}{Pew Threat}\\
\hline

[1em]

\hline
Observations       
\hline\hline
\end{tabular}
\end{table}
